Make sure transaction state resets after commit

[fixes #12566]

activerecord/lib/active_record/transactions.rb

@@ -295,7 +295,7 @@ module ActiveRecord
     def committed! #:nodoc:
       run_callbacks :commit if destroyed? || persisted?
     ensure
-      clear_transaction_record_state
+      @_start_transaction_state.clear
     end
 
     # Call the +after_rollback+ callbacks. The +force_restore_state+ argument indicates if the record

activerecord/test/cases/transaction_callbacks_test.rb

@@ -16,6 +16,11 @@ class TransactionCallbacksTest < ActiveRecord::TestCase
 
     after_commit :do_after_commit, on: :create
 
+    attr_accessor :save_on_after_create
+    after_create do
+      self.save! if save_on_after_create
+    end
+
     def history
       @history ||= []
     end
@@ -107,6 +112,16 @@ class TransactionCallbacksTest < ActiveRecord::TestCase
     assert_equal [], reply.history
   end
 
+  def test_only_call_after_commit_on_create_and_doesnt_leaky
+    r = ReplyWithCallbacks.new(content: 'foo')
+    r.save_on_after_create = true
+    r.save!
+    r.content = 'bar'
+    r.save!
+    r.save!
+    assert_equal [:commit_on_create], r.history
+  end
+
   def test_only_call_after_commit_on_update_after_transaction_commits_for_existing_record_on_touch
     add_transaction_execution_blocks @first